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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 06/15] netfilter: nf_tables: free base chain counters from worker
Date: Sat,  1 Jun 2019 20:23:31 +0200	[thread overview]
Message-ID: <20190601182340.2662-7-pablo@netfilter.org> (raw)
In-Reply-To: <20190601182340.2662-1-pablo@netfilter.org>

From: Florian Westphal <fw@strlen.de>

No need to use synchronize_rcu() here, just swap the two pointers
and have the release occur from work queue after commit has completed.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 28241e82fd15..2fed78b19abe 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1449,25 +1449,18 @@ static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
 	return newstats;
 }
 
-static void nft_chain_stats_replace(struct net *net,
-				    struct nft_base_chain *chain,
-				    struct nft_stats __percpu *newstats)
+static void nft_chain_stats_replace(struct nft_trans *trans)
 {
-	struct nft_stats __percpu *oldstats;
+	struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
 
-	if (newstats == NULL)
+	if (!nft_trans_chain_stats(trans))
 		return;
 
-	if (rcu_access_pointer(chain->stats)) {
-		oldstats = rcu_dereference_protected(chain->stats,
-					lockdep_commit_lock_is_held(net));
-		rcu_assign_pointer(chain->stats, newstats);
-		synchronize_rcu();
-		free_percpu(oldstats);
-	} else {
-		rcu_assign_pointer(chain->stats, newstats);
+	rcu_swap_protected(chain->stats, nft_trans_chain_stats(trans),
+			   lockdep_commit_lock_is_held(trans->ctx.net));
+
+	if (!nft_trans_chain_stats(trans))
 		static_branch_inc(&nft_counters_enabled);
-	}
 }
 
 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
@@ -6360,9 +6353,9 @@ static void nft_chain_commit_update(struct nft_trans *trans)
 	if (!nft_is_base_chain(trans->ctx.chain))
 		return;
 
+	nft_chain_stats_replace(trans);
+
 	basechain = nft_base_chain(trans->ctx.chain);
-	nft_chain_stats_replace(trans->ctx.net, basechain,
-				nft_trans_chain_stats(trans));
 
 	switch (nft_trans_chain_policy(trans)) {
 	case NF_DROP:
@@ -6379,6 +6372,7 @@ static void nft_commit_release(struct nft_trans *trans)
 		nf_tables_table_destroy(&trans->ctx);
 		break;
 	case NFT_MSG_NEWCHAIN:
+		free_percpu(nft_trans_chain_stats(trans));
 		kfree(nft_trans_chain_name(trans));
 		break;
 	case NFT_MSG_DELCHAIN:
-- 
2.11.0


  parent reply	other threads:[~2019-06-01 18:24 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-01 18:23 [PATCH 00/15] Netfilter/IPVS updates for net-next Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 01/15] ipvs: allow rs_table to contain different real server types Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 02/15] ipvs: add function to find tunnels Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 03/15] ipvs: strip udp tunnel headers from icmp errors Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 04/15] netfilter: xt_owner: Add supplementary groups option Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 05/15] netfilter: nf_flow_table: remove unnecessary variable in flow_offload_tuple Pablo Neira Ayuso
2019-06-01 18:23 ` Pablo Neira Ayuso [this message]
2019-06-01 18:23 ` [PATCH 07/15] netfilter: bridge: convert skb_make_writable to skb_ensure_writable Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 08/15] netfilter: ipvs: prefer skb_ensure_writable Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 09/15] netfilter: conntrack, nat: " Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 10/15] netfilter: ipv4: " Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 11/15] netfilter: nf_tables: " Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 12/15] netfilter: xt_HL: " Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 13/15] netfilter: tcpmss, optstrip: " Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 14/15] netfilter: replace skb_make_writable with skb_ensure_writable Pablo Neira Ayuso
2019-06-01 18:23 ` [PATCH 15/15] ipvs: add checksum support for gue encapsulation Pablo Neira Ayuso
2019-06-01 23:45 ` [PATCH 00/15] Netfilter/IPVS updates for net-next David Miller

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